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Host-parasite arms race in mutation modifications: indefinite escalation despite a heavy load?
1Department of Biology, Faculty of Science, Kyushu University, Fukuoka, Japan.
Journal of Theoretical Biology
|November 21, 1996
Summary
Host and parasite coevolution can drive mutation rates higher, especially with frequency-dependent selection. Deleterious mutations can stabilize this, leading to mixed mutation rates or collapse, impacting evolutionary dynamics.
Area of Science:
- Evolutionary biology
- Theoretical ecology
- Population genetics
Background:
- Host-parasite interactions drive rapid evolution.
- Frequency-dependent selection favors rarer genotypes.
- Mutation rate evolution is a key factor in coevolutionary dynamics.
Purpose of the Study:
- To investigate the theoretical evolution of mutation rates in host-parasite systems.
- To examine the role of mutation modifiers under frequency-dependent selection.
- To understand the impact of deleterious mutations on coevolutionary mutation rates.
Main Methods:
- Theoretical modeling of mutation modifier dynamics.
- Analysis of evolutionarily stable (ESS) mutation rates.
- Simulation of genotype-specific epidemiological interactions using Nicholson-Bailey models.
Main Results:
- Frequency-dependent selection can lead to escalating mutation rates, especially when modifiers increase offspring genetic diversity.
- Deleterious mutations can result in stable coexistence of high and low mutation rate strains.
- In host-parasite models, unchecked mutation rates can stabilize population dynamics, but costs of mutation can lead to parasite mutation acceleration and host mutation reduction.
Conclusions:
- Mutation rate evolution is a critical, yet complex, component of host-parasite coevolution.
- The presence and cost of deleterious mutations significantly shape evolutionary outcomes.
- Findings have implications for understanding the evolution of other genetic modifiers, such as recombination.